11 files declare their use of UpdateManager in Lightning Core 8.3

HooksTest.php in tests/src/Kernel/HooksTest.php

LightningCoreCommands.php in src/Commands/LightningCoreCommands.php

lightning_core.install in ./lightning_core.install

Contains install and update routines for Lightning.

lightning_core.module in ./lightning_core.module

Contains core functionality for the Lightning distribution.

ModuleInstallTest.php in tests/src/Kernel/ModuleInstallTest.php

Update8006Test.php in tests/src/Functional/Update/Update8006Test.php

Update8006Test.php in tests/src/Kernel/Update/Update8006Test.php

Update8007Test.php in tests/src/Kernel/Update/Update8007Test.php

UpdateCommand.php in src/Command/UpdateCommand.php

UpdateManagerTest.php in tests/src/Unit/UpdateManagerTest.php

UpdateManagerTest.php in tests/src/Kernel/UpdateManagerTest.php